<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入评论内容" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in commentsList" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>
<script>
import {Toast} from 'mint-ui'
export default {
    data(){
        return{
            commentsList:[],
            pageIndex:1,//默认显示第一页数据
            msg:''
        }
    },
    created(){
        
        this.getComments()
    },
    methods:{
        getComments(){
            this.$http.get('getcomments/'+this.id+'?pageindex='+this.pageIndex).then(res => {
                if(res.body.status === 0){
                    //每次点击加载更多，用老数据拼接上新数据
                    this.commentsList= this.commentsList.concat(res.body.message)
                }else{
                    Toast('获取评论失败')
                }
            })
        },
        getMore(){
            this.pageIndex++
            this.getComments()
        },
        postComment(){
            //校验评论数据是否为空
            if(this.msg.trim().length === 0){
                return Toast('评论内容不能为空')
            }
            //发送请求
            this.$http.post('postcomment/'+this.id,{
                content: this.msg.trim()//trim()清除空格
            })
            .then(res => {
                if(res.body.status === 0){
                    //手动拼接评论对象
                    let cmt = {
                        user_name:'匿名用户',
                        add_time: Date.now(),
                        content: this.msg.trim()
                    }
                    this.commentsList.unshift(cmt)
                    this.msg = ''
                }else{
                    Toast('评论提交失败')
                }
            })
        }
    },
    props:['id']
}
</script>
<style lang="scss" scoped>
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size:13px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>